直流电机是指将直流电送到直流电机，把直流电机的电能转换成机械能。这里首先要介绍如何将市电的交流电转换成需要的直流电。六十年代以前采用的是发电机–电机系统(F-D)，这种方法只有在电机由专用的发电机供电时才有可能。另—种是可控硅–电机系统(SCR-D)。两种系统的原理如下:艾默生5X00121G01控制器emerson通入到执行机构薄膜室的压力增加，使阀杆向下移动。并带动反馈杆绕支点转动，反馈凸轮也随之作逆时针方向转动，通过滚轮使副杠杆4绕支点转动，并将反馈弹簧拉伸，弹簧对主杠杆3的拉力与信号压力用在波纹管上的力达到力矩平衡时，仪表达到平衡状态。
5X00121G01
SAMSON萨姆森3731-3电动气动器报关单执行机构的阀位维持在一定的开度上，一定的信号压力就对应于一定的阀位开度。以上作用方式为正作用，若要改变作用方式，只要将凸轮翻转，A向变成B向等，即可。所谓正作用器，就是信号压力增加，输出压力亦增加:所谓反作用器，就是信号压力增加，输出压力则减少。一台正作用执行机构只要装上反作用器，就能实现反作用执行机构的动作;相反，一台反作用执行机构只要装上反作用器。
5X00121G01
A DC motor refers to the process of sending direct current to a DC motor and converting its electrical energy into mechanical energy. Firstly, we will introduce how to convert the AC power of the mains power into the required DC power. Before the 1960s, the generator motor system (F-D) was used, which was only possible when the motor was powered by a dedicated generator. Another type is thyristor motor system (SCR-D). The principles of the two systems are as follows: the Emerson 5X00121G01 controller increases the pressure applied to the diaphragm chamber of the actuator, causing the valve stem to move downwards. And it drives the feedback rod to rotate around the fulcrum, and the feedback cam also rotates counterclockwise. The auxiliary lever 4 is rotated around the fulcrum through the roller, and the feedback spring is stretched. When the tension of the spring on the main lever 3 is balanced with the force of the signal pressure applied to the bellows, the instrument reaches a balanced state.
5X00121G01
The valve position of the SAMSON 3731-3 electric pneumatic actuator customs declaration actuator is maintained at a certain opening, and a certain signal pressure corresponds to a certain valve position opening. The above mode of action is positive. To change the mode of action, simply flip the cam to change the direction from A to B, etc. The so-called positive action device refers to an increase in signal pressure and an increase in output pressure; the so-called reverse action device refers to an increase in signal pressure and a decrease in output pressure. A positive action actuator can achieve the action of a reverse action actuator as long as a reverse action device is installed; On the contrary, a reaction actuator only needs to be equipped with a reaction device.
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